I hear what you’re saying.
The picture obviously isn’t as clear as it’s mean to be to depict social equality.
im use to the version that depict it with disability which may help you see it from its true intention which may not translate into race.
So you have the “small” person
as Someone in a wheelchair. It isn’t meant to depict them as “lesser”. It’s a demonstration of a disability.
If you out equal boxes in front of a fence the person in the wheelchair still can’t see over the fence. However oh also shows where equality fails.
A person in a wheelchair can’t access a box. They need a ramp, they need the ability to get to the fence, somewhere to park to be able to get out of their vehicle in the wheelchair etc.
My ds is a wheelchair user and we see the picture as a good representation of barriers individuals face in life and he doesn’t see the fact the wheelchair user is effectively the smallest as him being down as lesser .
The model was designed to show that it’s about looking at what someone needs as an individual and giving them the opportunities to experience things equally by removing those barriers.
in the image shown here it’s about showing that the small person has no control over their height and therefore what they need individually isn’t equal to what others may need (or not for the tall person) to access something (in that case looking over the fence).
But if people aren’t seeing the image for what it was designed to show there is always a discussion to be had about how better to demonstrate the point.